684579 has 12 divisors (see below), whose sum is σ = 1062024. Its totient is φ = 391104.

The previous prime is 684569. The next prime is 684581. The reversal of 684579 is 975486.

It is not a de Polignac number, because 684579 - 2⁵ = 684547 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (684559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2182 + ... + 2475.

It is an arithmetic number, because the mean of its divisors is an integer number (88502).

2⁶⁸⁴⁵⁷⁹ is an apocalyptic number.

684579 is a deficient number, since it is larger than the sum of its proper divisors (377445).

684579 is a wasteful number, since it uses less digits than its factorization.

684579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674 (or 4667 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 684579 is about 827.3928933705. The cubic root of 684579 is about 88.1335352127.

The spelling of 684579 in words is "six hundred eighty-four thousand, five hundred seventy-nine".